exigency /ˈɛksɪdʒənsɪ/

• 1. 

  N-COUNT The exigencies of a situation or a job are the demands or difficulties that you have to deal with as part of it. 危急关头 [正式] [usu pl, usu N 'of' n]

  例：

  ...the exigencies of a wartime economy.

  ...战时经济的危急关头。